Xamarin在StackLayout重叠布局上面形成Listview

我有一个ListView，我需要堆叠在另一个水平Stack Layout下 . 无论我做什么，似乎ListView重叠了它上面的所有内容 . 我需要它没有这种行为，实际上显示上面的布局 . 我只是不知道如何，任何帮助将不胜感激 .

我还尝试将两者放在一个网格中，并设法释放顶部的空间，但仍然没有出现任何测试标签 .

如上所示，ListView只是重叠在它上面的（带有标签的堆栈布局），以及在Aaron屏幕上方的两个条目上方显示 .

<?xml version="1.0" encoding="UTF-8"?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" 
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" 
             x:Class="engME.YourFullNamesListPage">

    <StackLayout>
        <StackLayout Orientation="Horizontal">
            <Label Text="Test 1" HorizontalTextAlignment="Center"/>
            <Label Text="Test 2" HorizontalTextAlignment="Center"/>
            <Label Text="Test 3" HorizontalTextAlignment="Center"/>
            <Label Text="Test 4" HorizontalTextAlignment="Center"/>
        </StackLayout>
        <StackLayout Orientation="Vertical" VerticalOptions="Fill" HorizontalOptions="FillAndExpand">
            <ListView x:Name="FullNamesList" VerticalOptions="FillAndExpand" RowHeight="50">
                <ListView.ItemTemplate>
                    <DataTemplate>
                        <ViewCell>
                            <Grid>
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="*"/>
                                    <ColumnDefinition Width="1.1*"/>
                                    <ColumnDefinition Width=".3*"/>
                                </Grid.ColumnDefinitions>
                                <Label FontSize="Large" 
                                       FontAttributes="Bold" 
                                       HorizontalTextAlignment="Start"
                                       Margin="20,0,0,0"
                                       VerticalTextAlignment="Center"
                                       Grid.Row="0"
                                       Grid.Column="0">
                                    <Label.Triggers>
                                        <DataTrigger TargetType="Label" Binding="{Binding Gender}" Value="F">
                                            <Setter Property="Text" Value="{Binding Name}"/>
                                            <Setter Property="TextColor" Value="#cc0066"/>
                                        </DataTrigger>
                                        <DataTrigger TargetType="Label" Binding="{Binding Gender}" Value="M">
                                            <Setter Property="Text" Value="{Binding Name}"/>
                                            <Setter Property="TextColor" Value="#007acc"/>
                                        </DataTrigger>
                                        <DataTrigger TargetType="Label" Binding="{Binding Gender}" Value="A">
                                            <Setter Property="Text" Value="{Binding Name}"/>
                                            <Setter Property="TextColor" Value="#00994d"/>
                                        </DataTrigger>
                                    </Label.Triggers>
                                </Label>
                                <Label Text="{Binding ShortMeaning}"
                                       FontSize="Small"
                                       TextColor="Gray"
                                       VerticalTextAlignment="Center"
                                       Grid.Row="0"
                                       Grid.Column="1">
                                </Label>
                                <Image Source="favorite.png"
                                       Grid.Row="0"
                                       Grid.Column="2"
                                       Scale=".7">
                                </Image>
                            </Grid>
                        </ViewCell>
                    </DataTemplate>
                </ListView.ItemTemplate>    
            </ListView>
        </StackLayout>
    </StackLayout>
</ContentPage>